guys
I noticed there is a bug in the chart time periodicity pivot. For example if
you use the example birth data as the datasource/table ("birth_names), the
chart return and error
`'NoneType' object is not iterable`
so I went down and dig in the code and realised there is some issue in getting
the metrics values from metric. So I added that line below that make the chart
working (try to use another data source with data time resolution of weeks or
day to see the overlapping of all the lines as all the example data are with
year minimum resolution hence can overlap them as there is no frequecy option
higher than year).
I think the problem is that in the class `NVD3TimePivotViz`, the method
`query_obj` can't override the default method that is in the base class
`BaseViz`.
Am I right?
[ Full content available at:
https://github.com/apache/incubator-superset/pull/5928 ]
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